Nabnerix
- Nabner lines
- X-sums
The brief
- Normal sudoku rules apply, i.e. each row, colum and 3x3 region has to contain the digits from 1 to 9 once each.
- Nabner lines: The golden lines are Nabner lines, i.e. on such a line there may not be consecutive or repeated digits.
- X-sums: Clues outside the grid indicate the sum of the first X digits in the respective row or column where X is the first digit seen from the clue.